Hi everyone
i I have a 2008 LS auto and I ordered a master cylinder earlier this year and it was determined defective as I’m losing my brake pedal force. I was told it’s leaking from the bypass.

according to the dealer the master is no longer available but I see them on rockauto and I’ve ordered the previous one from there so I’ll be doing a warranty claim hopefully.

But I just want to make sure I am getting the correct one before I do so. Maybe that is the issue?

I do not have stability control, traction etc so I originally ordered Acdelco 1741153 which states “except active brake control JL4, with 4 speed auto trans”

is this the correct one?
dealers here won’t tell me the part number,( I’ve called a few) I assume they are losing money by telling us part numbers so we can order them elsewhere?

 

2008 2.2 no stability control

 

Found this on gmpartsdirect. What’s the difference?

 

Oldblue, that says gold/professional, isn't that typically a lower quality part?

 

Probably, I would order the GM 15939484 , that’s new from GM

 

I want to make sure I got the right one. Considering I thought the one I got originally from rockauto was the correct one.

 

I got off the phone with gmpartsdirect and they confirmed the one I bought originally ACDelco 1741153 is the correct one for my vehicle as the actual GM part is 15939484 which is the picture I posted from their website.
so it looks like I ordered the correct one, I guess I got a defective unit.

 

Are you going to replace the booster? That is probably your real problem.

 

I replaced the master and booster earlier this year. According to the mechanic it is the master cylinder.